When I was little, my mom taught me a little from the old Baltimore Catechism.
1. Who made us?
A. God made us.
2. Who is God?
A. God is the Supreme Being, infinitely perfect, who made all things and keeps them in existence.
3. Why did God make us?
A. God made us to show forth His goodness and to share with us His everlasting happiness in heaven.
4. What must we do to gain the happiness of heaven?
A. To gain the happiness of heaven we must know, love, and serve God in this world.
The newer Catholic Catechism gives a much wordier answer. But to be honest … I’m kinda sorry the RCC stopped using the old Baltimore Catechism.
There’s a lot to be said for memorizing simple things that have profound meaning.
I’m still chewing over those first four things 5 decades later and am still nowhere near to really understanding all the glory, joy and wonder in them.
As for choosing an over-arching guideline for my entire life, I’ve never found anything better than this:
The Catechism of the Catholic Church
The Baltimore Catechism